Alien Swarm

Alien Swarm is a freeware, multiplayer, top-down shooter video game by Valve Corporation.wikipedia
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Unreal Tournament 2004

2004UT 2004UT2K4
It is a remake of a mod for Unreal Tournament 2004, and it was developed by the original team, who were hired by Valve Corporation during the course of the development process. A Source engine sequel was announced in 2005, under the title of Alien Swarm: Infested, as a Source engine sequel to the original Unreal Tournament 2004 mod.
Alien Swarm was the winner of Phase 4 of the Make Something Unreal Contest for best non-first-person shooter modification.

Source (game engine)

SourceSource engineSource game engine
A Source engine sequel was announced in 2005, under the title of Alien Swarm: Infested, as a Source engine sequel to the original Unreal Tournament 2004 mod.
This branch later fueled the releases of Alien Swarm and Portal 2, the former released with source code outlining many of the changes made since the branch began.

Freeware

freefree of chargeregisterware
Alien Swarm is a freeware, multiplayer, top-down shooter video game by Valve Corporation.

Shoot 'em up

rail shooterscrolling shooterrun and gun
Alien Swarm is a freeware, multiplayer, top-down shooter video game by Valve Corporation.

Valve Corporation

ValveValve SoftwareValve’s
Alien Swarm is a freeware, multiplayer, top-down shooter video game by Valve Corporation.

Video game remake

remakeenhanced remakeremakes
It is a remake of a mod for Unreal Tournament 2004, and it was developed by the original team, who were hired by Valve Corporation during the course of the development process.

Cooperative gameplay

co-opcooperativecooperative multiplayer
Four players can join a single co-operative game, the aim of which is to progress through science fiction-themed levels while eliminating waves of aliens.

Science fiction

sci-fiscience-fictionSF
Four players can join a single co-operative game, the aim of which is to progress through science fiction-themed levels while eliminating waves of aliens.

Achievement (video gaming)

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The game includes persistent statistics, unlockable equipment, and achievements.

Extraterrestrial life

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In the game's only official campaign, Jacob's Rest, a swarm of invasive aliens have taken over a colonized planet in December 2052.

Thermonuclear weapon

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The marines then guide a thermonuclear bomb (originally meant for excavation purposes) through the complex and activate its timer.

Computer Games Magazine

Computer Games Strategy PlusStrategy PlusComputer Games
The mod was Mod of the Year for GameSpy in 2004, and was a runner-up for Computer Games Magazines 2004 "Best Mod" award, losing to Red Orchestra: Combined Arms.

Red Orchestra: Ostfront 41-45

Red OrchestraRed Orchestra Mod
The mod was Mod of the Year for GameSpy in 2004, and was a runner-up for Computer Games Magazines 2004 "Best Mod" award, losing to Red Orchestra: Combined Arms.

Left 4 Dead

Zoeya man-made virusAI Director
In July 2010 with the announcement of Alien Swarm, it was revealed that Valve had hired the team behind Alien Swarm, who had finished the mod between working on other Valve products such as Left 4 Dead and Portal 2.

Portal 2

its sequelLab RatP-Body
In July 2010 with the announcement of Alien Swarm, it was revealed that Valve had hired the team behind Alien Swarm, who had finished the mod between working on other Valve products such as Left 4 Dead and Portal 2.

Software development kit

SDKSDKsdevelopment kits
An Alien Swarm software development kit (SDK) including buildable source code was released alongside the game.

Compiler

compiledcompilerscompile
An Alien Swarm software development kit (SDK) including buildable source code was released alongside the game.

Source code

codesourcesource file
An Alien Swarm software development kit (SDK) including buildable source code was released alongside the game.

Mod (video gaming)

modmodsmodding
It is a remake of a mod for Unreal Tournament 2004, and it was developed by the original team, who were hired by Valve Corporation during the course of the development process. This allows total conversion mods, which do not rely on content from other Valve games, to be free to all as well - a significant business decision that echoes the strategy of the Unreal Development Kit.

Unreal Engine

Unreal Engine 4Unreal Engine 3Unreal Engine 2.0
This allows total conversion mods, which do not rely on content from other Valve games, to be free to all as well - a significant business decision that echoes the strategy of the Unreal Development Kit.

Software license

licenselicensedlicenses
The SDK and software license allows arbitrary usage and sharing but only for non-commercial purposes.

Metacritic

metacritic.commetascoreuniversal acclaim
Alien Swarm received positive reviews upon release, with a 77/100 on aggregate review score website Metacritic.

Rock, Paper, Shotgun

Rock Paper ShotgunRock, Paper, Shotgu''n
Rock, Paper, Shotgun placed Alien Swarm 18th on its list of "The 50 Best Free games on PC" (of all time) in 2016.